277 lines
10 KiB
Python
277 lines
10 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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from sleekxmpp.xmlstream import ElementBase, ET
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class DiscoInfo(ElementBase):
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"""
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XMPP allows for users and agents to find the identities and features
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supported by other entities in the XMPP network through service discovery,
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or "disco". In particular, the "disco#info" query type for <iq> stanzas is
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used to request the list of identities and features offered by a JID.
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An identity is a combination of a category and type, such as the 'client'
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category with a type of 'pc' to indicate the agent is a human operated
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client with a GUI, or a category of 'gateway' with a type of 'aim' to
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identify the agent as a gateway for the legacy AIM protocol. See
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<http://xmpp.org/registrar/disco-categories.html> for a full list of
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accepted category and type combinations.
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Features are simply a set of the namespaces that identify the supported
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features. For example, a client that supports service discovery will
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include the feature 'http://jabber.org/protocol/disco#info'.
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Since clients and components may operate in several roles at once, identity
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and feature information may be grouped into "nodes". If one were to write
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all of the identities and features used by a client, then node names would
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be like section headings.
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Example disco#info stanzas:
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<iq type="get">
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<query xmlns="http://jabber.org/protocol/disco#info" />
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</iq>
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<iq type="result">
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<query xmlns="http://jabber.org/protocol/disco#info">
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<identity category="client" type="bot" name="SleekXMPP Bot" />
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<feature var="http://jabber.org/protocol/disco#info" />
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<feature var="jabber:x:data" />
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<feature var="urn:xmpp:ping" />
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</query>
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</iq>
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Stanza Interface:
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node -- The name of the node to either
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query or return info from.
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identities -- A set of 4-tuples, where each tuple contains
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the category, type, xml:lang, and name
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of an identity.
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features -- A set of namespaces for features.
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Methods:
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add_identity -- Add a new, single identity.
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del_identity -- Remove a single identity.
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get_identities -- Return all identities in tuple form.
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set_identities -- Use multiple identities, each given in tuple form.
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del_identities -- Remove all identities.
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add_feature -- Add a single feature.
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del_feature -- Remove a single feature.
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get_features -- Return a list of all features.
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set_features -- Use a given list of features.
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del_features -- Remove all features.
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"""
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name = 'query'
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namespace = 'http://jabber.org/protocol/disco#info'
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plugin_attrib = 'disco_info'
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interfaces = set(('node', 'features', 'identities'))
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lang_interfaces = set(('identities',))
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# Cache identities and features
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_identities = set()
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_features = set()
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def setup(self, xml=None):
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"""
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Populate the stanza object using an optional XML object.
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Overrides ElementBase.setup
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Caches identity and feature information.
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Arguments:
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xml -- Use an existing XML object for the stanza's values.
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"""
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ElementBase.setup(self, xml)
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self._identities = set([id[0:3] for id in self['identities']])
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self._features = self['features']
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def add_identity(self, category, itype, name=None, lang=None):
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"""
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Add a new identity element. Each identity must be unique
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in terms of all four identity components.
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Multiple, identical category/type pairs are allowed only
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if the xml:lang values are different. Likewise, multiple
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category/type/xml:lang pairs are allowed so long as the names
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are different. In any case, a category and type are required.
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Arguments:
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category -- The general category to which the agent belongs.
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itype -- A more specific designation with the category.
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name -- Optional human readable name for this identity.
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lang -- Optional standard xml:lang value.
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"""
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identity = (category, itype, lang)
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if identity not in self._identities:
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self._identities.add(identity)
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id_xml = ET.Element('{%s}identity' % self.namespace)
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id_xml.attrib['category'] = category
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id_xml.attrib['type'] = itype
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if lang:
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id_xml.attrib['{%s}lang' % self.xml_ns] = lang
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if name:
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id_xml.attrib['name'] = name
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self.xml.append(id_xml)
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return True
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return False
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def del_identity(self, category, itype, name=None, lang=None):
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"""
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Remove a given identity.
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Arguments:
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category -- The general category to which the agent belonged.
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itype -- A more specific designation with the category.
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name -- Optional human readable name for this identity.
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lang -- Optional, standard xml:lang value.
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"""
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identity = (category, itype, lang)
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if identity in self._identities:
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self._identities.remove(identity)
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for id_xml in self.findall('{%s}identity' % self.namespace):
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id = (id_xml.attrib['category'],
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id_xml.attrib['type'],
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id_xml.attrib.get('{%s}lang' % self.xml_ns, None))
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if id == identity:
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self.xml.remove(id_xml)
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return True
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return False
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def get_identities(self, lang=None, dedupe=True):
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"""
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Return a set of all identities in tuple form as so:
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(category, type, lang, name)
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If a language was specified, only return identities using
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that language.
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Arguments:
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lang -- Optional, standard xml:lang value.
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dedupe -- If True, de-duplicate identities, otherwise
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return a list of all identities.
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"""
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if dedupe:
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identities = set()
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else:
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identities = []
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for id_xml in self.findall('{%s}identity' % self.namespace):
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xml_lang = id_xml.attrib.get('{%s}lang' % self.xml_ns, None)
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if lang is None or xml_lang == lang:
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id = (id_xml.attrib['category'],
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id_xml.attrib['type'],
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id_xml.attrib.get('{%s}lang' % self.xml_ns, None),
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id_xml.attrib.get('name', None))
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if dedupe:
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identities.add(id)
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else:
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identities.append(id)
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return identities
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def set_identities(self, identities, lang=None):
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"""
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Add or replace all identities. The identities must be a in set
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where each identity is a tuple of the form:
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(category, type, lang, name)
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If a language is specifified, any identities using that language
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will be removed to be replaced with the given identities.
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NOTE: An identity's language will not be changed regardless of
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the value of lang.
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Arguments:
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identities -- A set of identities in tuple form.
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lang -- Optional, standard xml:lang value.
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"""
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self.del_identities(lang)
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for identity in identities:
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category, itype, lang, name = identity
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self.add_identity(category, itype, name, lang)
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def del_identities(self, lang=None):
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"""
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Remove all identities. If a language was specified, only
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remove identities using that language.
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Arguments:
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lang -- Optional, standard xml:lang value.
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"""
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for id_xml in self.findall('{%s}identity' % self.namespace):
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if lang is None:
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self.xml.remove(id_xml)
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elif id_xml.attrib.get('{%s}lang' % self.xml_ns, None) == lang:
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self._identities.remove((
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id_xml.attrib['category'],
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id_xml.attrib['type'],
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id_xml.attrib.get('{%s}lang' % self.xml_ns, None)))
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self.xml.remove(id_xml)
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def add_feature(self, feature):
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"""
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Add a single, new feature.
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Arguments:
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feature -- The namespace of the supported feature.
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"""
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if feature not in self._features:
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self._features.add(feature)
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feature_xml = ET.Element('{%s}feature' % self.namespace)
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feature_xml.attrib['var'] = feature
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self.xml.append(feature_xml)
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return True
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return False
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def del_feature(self, feature):
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"""
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Remove a single feature.
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Arguments:
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feature -- The namespace of the removed feature.
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"""
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if feature in self._features:
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self._features.remove(feature)
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for feature_xml in self.findall('{%s}feature' % self.namespace):
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if feature_xml.attrib['var'] == feature:
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self.xml.remove(feature_xml)
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return True
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return False
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def get_features(self, dedupe=True):
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"""Return the set of all supported features."""
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if dedupe:
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features = set()
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else:
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features = []
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for feature_xml in self.findall('{%s}feature' % self.namespace):
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if dedupe:
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features.add(feature_xml.attrib['var'])
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else:
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features.append(feature_xml.attrib['var'])
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return features
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def set_features(self, features):
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"""
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Add or replace the set of supported features.
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Arguments:
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features -- The new set of supported features.
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"""
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self.del_features()
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for feature in features:
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self.add_feature(feature)
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def del_features(self):
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"""Remove all features."""
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self._features = set()
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for feature_xml in self.findall('{%s}feature' % self.namespace):
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self.xml.remove(feature_xml)
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